Long-range directional movement of an interphase chromosome site

Current Biology : CB
Chien-Hui ChuangAndrew S Belmont

Abstract

Increasing evidence suggests functional compartmentalization of interphase nuclei. This includes preferential interior localization of gene-rich and early replicating chromosome regions versus peripheral localization of gene-poor and late replicating chromosome regions , association of some active genes with nuclear speckles or transcription "factories", and association of transcriptionally repressed genes with heterochromatic regions. Dynamic changes in chromosome compartmentalization imply mechanisms for long-range interphase chromatin movements. However, live cell imaging in mammalian cells has revealed limited chromatin mobility, described as "constrained diffusion". None of these studies, though, have examined a chromosome locus undergoing an inducible repositioning between two different nuclear compartments. Here we demonstrate migration of an interphase chromosome site from the nuclear periphery to the interior 1-2 hr after targeting a transcriptional activator to this site. Spot redistribution is perturbed by specific actin or nuclear myosin I mutants. Extended periods of chromosome immobility are interspersed with several minute periods in which chromosomes move unidirectionally along curvilinear paths oriented roughly...Continue Reading

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